The results of the retrievals of methane total column in the atmosphere of Western Siberia using high resolution IR solar spectra registered in May and June 2019 by the Bruker IFS125M Fourier spectrometer are presented. The obtained time series of methane total column are analyzed and compared with the collocated IASI satellite data.
To determine the methane emission intensities (EIs) in St. Petersburg and its suburbs measurements of the methane (CH4) mole fraction and total column were used, the analysis of which was carried out using the mass balance method. For the suburban territory the value of EIs was estimated from the events of nocturnal accumulation which were detected using continuous CH4 mole fraction measurements at the atmospheric monitoring station of Saint Petersburg State University (SPbU) located in Peterhof. It was obtained that EI values for 2014-2015 for St. Petersburg suburbs were of (44±27) t/(km2 ∙year). The determination of EI for the St. Petersburg territory including the area of the city center was carried out using two approaches: first, using local CH4 concentrations monitored at SPbU and Voeikov MGO stations, and second, using the results of an observational campaign in March-April 2019 jointly organized by Saint Petersburg State University, Karlsruhe Institute of Technology, the University of Bremen. EI values for the city center derived using the first approach - 120±80 t/(km2 ∙year), according to the approach based on results of observational campaign - 141±78 t/(km2 ∙year).
Emissions values, as well as emission ratios for greenhouse and reactive gases were evaluated for anthropogenic sources and wildfires. Our study is based on ground-based Fourier transform infrared measurements of CO, HCN, C2H6, H2CO, OCS and CH4 total columns, zenith-sky DOAS measurements of tropospheric column of NO2 and results of the local monitoring of CH4, CO2 and CO concentrations performed at the St. Petersburg site during 2013-2016. In addition, we involve into analysis the following data and information: satellite observations of the tropospheric column of NO2 (OMI), aerosol optical thickness (MODIS) and ultraviolet aerosol index (OMI, OMPS); information on location and intensity of wildfires; AERONET data on aerosol optical thickness; results of trajectory and dispersion simulations using HYSPLIT model.
Methane (CH) and carbon monoxide (CO) total column amounts (TCAs) measured at the Research Institute of Physics of St. Petersburg State University (Russia) were used for: 1. study of temporal variability of CH4 and CO; 2. identification of source regions of CO and CH4 using trajectory analysis. CH4 and CO showed distinct annual cycle with the amplitude of about 3 and 25 respectively. Period of 1999-2002 has a significant decline of CH4 TCA for the St. Petersburg region. The suggested reason is hot and dry summers of 1998-2002. October 1998-March 1999 is characterized by the strong irregular disturbances of CO TCA. Growth rates of CO TCA have changed at this period from (3.5±2.3)%/yr. (for 1995-1998) up to (-2.1±1.5)%/yr. (for 1999-2002). Enhanced CO and CH4 TCA levels are observed for air masses originated from the sectors of the North Russia continental Russia and the Eurasia Europe can be classified as moderately polluted territory. Clean air comes from the Baltic Sea Arctic Ocean and Scandinavia. Distribution of CO pollution levels over sectors repeats qualitatively situation for CH4.
Methane (CH4) and carbon monoxide (CO) total column amounts (TCA) measured at the Research Institute of Physics of St. Petersburg State University (Russia) were used for: 1. study of temporal variability of CH4 and CO; 2. identification of source regions of CO and CH4 using trajectory analysis. CH4 and CO showed distinct annual cycle with the amplitude of about 3% and 25% correspondingly. Period of 1999-2002 has a significant decline of CH4 TCA for the St. Petersburg region. The suggested reason is hot and dry summers of 1998-2002. October 1998 - March 1999 is characterized by the strong irregular disturbances of CO TCA. Growth rates of CO TCA have changed at this period from (3.5±2.3)%/yr (for 1995-1998) up to (-2.1±1.5)%/yr (for 1999-2002). Enhanced CO and CH4 TCA levels are observed for air masses originated from the sectors of the North Russia, continental Russia and the Eurasia. Europe can be classified as moderately polluted territory. Clean air comes from the Baltic Sea, Arctic Ocean and Scandinavia. Distribution of CO pollution levels over sectors repeats qualitatively situation for CH4.
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